3 years ago

Which value of x must be excluded from the domain of the function, y = 9 / 2(x + 7)?

1 answer:

8 0

B) -7 because the dominator must be different by 0.

2(x + 7) ≠ 0 |divide both sides by 2

x + 7 ≠ 0 |subtract 7 from both sides

x ≠ -7

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Choose all the numbers that could be common denominators for 2/3 and 3/4. 8, 12, 16, 36, 48

Ksivusya [100]

Answer: 12 36 and 48

7 0

3 years ago

Which two numbers multiply to 60 and add to -2?

USPshnik [31]

$xy=60\\
x+y=-2\\\\
xy=60\\
x=-y-2\\\\
(-y-2)y=60\\
-y^2-2y-60=0\\
y^2+2y+60=0\\
y^2+2y+1+59=0\\
(y+1)^2=-59
$

There are no such numbers in real numbers.
Do you perhaps want a solution in complex numbers?

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3 years ago

The width of a field is 3 miles less than the length. The square mileage of the plot is 18 miles squared. Find the dimensions.

kherson [118]

LW = A
L(L - 3) = 18
L^2 - 3L - 18 = 0
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L could be 6 or -3 ( -3 cannot be a length of a side of a rectangle since it’s negative.)
So L = 6 and W= 3

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3 years ago

Subtract 5b − 3c from −8a − 2b − 10c

erik [133]

Answer:

-8a - 7b - 7c

Step-by-step explanation:

-8a - 2b - 10c - (5b - 3c)

Negate 5b and -3c

-8a - 2b - 10c - 5b + 3c = -8a - 7b - 7c

3 0

3 years ago